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The code of federal regulations cfr is a codification of the general and permanent rules published in the federal register by the executive departments and agencies of the federal government. This information is current as of april 1 2018 this online reference for cfr title 21 is updated once a year for the most up to date version of cfr title 21 go to the electronic code of federal regulations ecfr. The information on this page is current as of april 1 2018 for the most up to date version of cfr title 21 go to the electronic code of federal regulations ecfr. Code of federal regulations title 21 food and drugs pt 500 599 revised as of april 1 2011 office of the federal register us on amazoncom free shipping on qualifying offers. Title 21 food and drugs title 21 food and drugs electronic code of federal regulations e cfr